I went looking for examples and searched 80A filter and found very little on the main sub. So here is Velvia 100 with an 80A filter including a comparison at the end.
Tiffen 55mm 80A Filter 5580A - Adorama
Tiffen 4 x 5.65" 80A Color Conversion Filter 4565080A B&H Photo
Formatt Hitech 80A Color Conversion Filter (43mm) BF 43-CTC80A
How to Use Presets and Filters
File:80a comparison.jpg - Wikimedia Commons
Cokin 020 A020 Blue 80A Filter A Series Used Bin #cu020 | eBay
Hoya 80A 49mm Daylight to Tungsten Conversion Glass Filter (Blue) - Walmart.com
Choosing a Color/Planetary Filter
Cokin Blue 80A (020) – Cokin Filters
GSO 1.25" Color / Planetary Filter - #80A Medium Blue
Wratten 80A Filter, M67, multi-coated, metal mount - WITTNER FILM
RENT TIFFEN 4X5.65 80A FILTER Rental NYC - AdoramaRentals
Cokin X-Pro 020 80A (Blue) Color Conversion Resin Filter CX020
Kodak No 80A (1843663) Filter for sale online | eBay
Hoya | 49mm 80A Filter | B4980A
80A Color Conversion Screw-In Filter - 5880A – The Tiffen Company
80A Blue and #38A Dark Blue filters best for viewing Jupiter! - Vendor and Group Announcements - Cloudy Nights
Hoya 80C Filter | Free shipping w/ $25 Purchase – Hoya Filters
Hoya 80A Filter | Free shipping w/ $25 Purchase – Hoya Filters
Filter 80A for night street photos? | I Shoot Film | Flickr
Astro-Tech #80A Medium blue 1.25" color filter | Astronomics.com
55mm Kenko 80A Filter - Blue Color Correction - NEW | eBay
Tiffen 67mm 80A Filter at KEH Camera
